MARANA, Ariz. – When Tim Clark rolled in a 68-foot putt for birdie at the par-4 fifth hole he might have figured it would be his day. It was the first of six birdies Clark would make in 16 holes en route to upsetting Tiger Woods,

4 and 2, in the second-round of the Accenture Match Play Championship.

Having lost to Woods, 5 and 4, in 2007, Clark knew what to expect yesterday. Lots of media and lots of fans, pulling mostly for Woods.

“You either let it get the best of you or you thrive on it,” Clark said. “If you worry about it, it’s certainly going to get the best of you. I knew I had to treat it like another round of golf and go out and play.”

The 33-year old South African feared the worst when Woods holed out from the bunker at the par-4 14th to cut Clark’s lead to 2-up with four to play.

“I figured well, here we go, it’s about to start now,” he said. “I still calmed myself down. There’s not much you can do. I can’t change what Tiger is going to do. I can only make pars and birdies out there.”

Clark, who has never won on the PGA Tour, made all pars and birdies, completing his second bogey-free round of the tournament.

“It’s obviously a massive victory for me,” said Clark, ranked 33rd in the world. “He doesn’t get beaten very often.”

With Woods losing and Vijay Singh beaten by Luke Donald in 19 holes, all four top seeds have been eliminated.

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Phil Mickelson, who blew a 4-up lead with 5 to play against Angel Cabrera on Wednesday, nearly did the same against Zach Johnson.

Mickelson was again 4-up with 5 to go, but he made a bogey at the next hole, and Johnson made birdies at the 15th and 17th to whittle Mickelson’s lead to 1-up going to the 18th hole.

Needing at least a birdie to extend the match, Johnson reached the green in two, but couldn’t make the 34-footer to put the pressure on Mickelson, who faces Stewart Cink in the third round.

Cink needed 23 holes to beat Lee Westwood.

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Anthony Kim, ranked 11th in the world, had the misfortune of running into the hottest golfer in the tournament.